Improvement in lifting-jacks



G. W. HUNTER.

LIF'IING-JACK.

Patented June 13 MPEIERS, PHOTO-UTHDGRAFHER, WASHINGTQN. D. C. I

UNITED-STATES GEORGE w. HUNTER, OF PHILADELPHIA, PENNSYLVANIA,AssIGNoaQoE PATENT OFFICE.

PART OF HIS RIGHT TO J. PARKER NORRIS, OF SAME PLACE, HENRY M.

BAKER, on WASHINGTON, DISTRICT O ooLUMBIA, AnnTHEoDo "LU cHAsE, OFPHILADELPHIA, PENNSYLVANIA," i

.IMPRQVEMENT lNLlFTlNG-JACKS.

Specification forming part of Letters Patent No. 178,777, dated June 13,1876; application filed May 151181 J T 0 all whom it may concern;

Be it known that-I, GEORGE W. HUNTER, of the city and county ofPhiladelphia, State of Pennsylvania, have invented an ImprovedLifting-Jack, of which the following is the specification s The objectof my invention is. an improved liftingjack constructed, as fullydescribed hereafter, to increase the capacity of the jack, reduce thecost of manufacture, and facilitate manipulation.

In? the accompanying drawing, Fig. 1 is a perspective view of myimproved lifting-jack, a portion of one of'the side pieces,being'detache-d, Fig. 2, a front elevation; Fig. 3, a sectionalelevation and Fig. 4, an elevation of one of the side pieces. 7

The standard B of the jack consists of two side pieces, b b, of castmetal, each having on its inner face at the lower end a flange, c, atthe upper end a flange, d, and near the front edge two parallel ribs, 6i. The side pieces are placed with the edges of their flanges incontact, and are bolted through the lower flanges to a metal base-plate,A, the front edge of which, below the ribs 7 is cut away, forming arecess, a. The flanges d are -recessed, forming an opening for thepassage of alifting-bar, G, which has at thc.lower end a foot-piece, f,and at the sides wings s s, which extend between the ribs t i, and atthe front.

edge'of the bar are transverse ribs or serrations beveled on both sides,as shown. To a lateral arm, g, at. the upper end of the bar 0, is hungan adjustable arm, D, pointed at the lower end, and having attachedthereto'one end of a chain, E, at the opposite end of which is .a hook,F. In front of the bar 0,'between the side pieces, is hung adoublepawl,G,

either end of which may be brought in contact with the serrated edge ofthe bar.

To the inner 'end'of a hand-lever, I, vibrat ing between'the sidepieces, is hung a link, K, which is jointed at the lower end to theinner end of a tilting-dog, H, the bar 0 extending through the latter,which consists of two flanged side pieces, at t, bolted together. The

. link K is of such a lengththat when the lever I is elevated to theposition shown in dotted lines, Fig. 3, the dog will strike the upperends of the ribs 6, and will be brought to a horizontal position. A11arm, L, hung to ears on the lever I, rests upon a lug, m, at theinherside of the side piece I), for a purpose de-- scribed hereafter.

From the rear of the standard extends an arm, J, supported by a brace,K, and limiting .the downward movement of the lever, which, as itapproaches the arm, tilts the dog H,

clamps, the bar O, and raises both. The pawl G, when arranged, as shownin Fig. 3, prevents the descent of the bar, while the dog H slidesdownward thereon, as the'lever I is raised. When thelo'ng arm of thelever is' again depressed the dog clamps the bar a d carries it upward,the operations being repeated, as often as may be necessary, to raisethe bar to the desired extent.

As the plate A is cutaway beneath'thc ribs 2' i the bar may descend withthe foot-piece f below the plate, to permit the foot-piece to beinserted below a railway-tic or other object, X, Fig. 3, the wings 8extending between the ribs 1, which guide the bar, and the pointed arm Dbearing upon the top of the tie and clamping the latter tothe'foot-piece.

'Upon elevating the bar in the manner already described the end of thetie will be raised, the standard assuming an inclined position inaccordance with the angle assumed by the tie, and firmly retaining thelatter. To release the bar, the lever is elevated until the arm Lstrikes the pawl G and turns it to the-position shown in dotted lilies,Fig. 3, and the dog 11 rests in a horizontal position on r the ribs 2',when the bar, being no longer con is introduced beneath one of the railsfrom the inner side, and the hook F isattached t0 I insiii-ingthe wiredto maintain ital: about rightapglee x ithetiv. WVheu the lever I isbrought upon nip ulate standard of two pieees,eacl1 capable of beingClStfIOlIl :tpattern without a uol e,feeilitu tes be made 'at a smalleost, while the steadiness which may be imparted to thet ool in opera,-

gwithwhieh the bar may he raised, scouted;

and released, the security with which the obis retained, constituteimpotbe. ii each havi flangeslcd his iiie'ise 1 ba 'r' earryl'iifi iuadf utabl arm,fD,substaui-f tia l ly ae and forthe purpose set forth. i2. The combinz'ltion ofthesliding bar of lifting-jack and a ol ztihsecured perlnzi el itly to the foit' i M 3;,The' dombinatioma thestandardmigill lied. i

4. The ldo l hle-e gled pmvlcombined with i the slidilifiliii Iiiiiiigteeth inclined at both sides, to arrest the movement of the fba r in jeitheiigli 'eetiol es specified. y

M 5, Tlieeoiiiljiiizltioiioftli lilliilbii*; i)ew], ofiefeting-lever I,and a L wherebyflthek i I it ipawl is thrown outward.fol eleyating thelejvelyy f substantially as described 1 i renew; I

wit-w t; H i I V lsue semm i

